Cast side frame for car trucks



Sept. 20, 1927. 1,642,793

' H.VV.STERTZBACF I CAST SIDE FRAME FOR CAR TRUCKS Filed March 18, 1925 @f/WWW# attoznaus Patented Sept. 20, 1927.

.i UNlTEDfSTATES".PATENT OFFICE.

HARRY WAETEE STERTZBACH, OF COLUMBUS, OHIO, ASSIGNOR TO THE BUCKEYE STEEL CASTINGS COMPANY, OF COLUMBUS, OHIO.

CAST sIDE EEAME Eon cAE'rmIcxs.

Applicatiqn filed March 18, 1925. Serial No. 16,445.

This invention relates to cast side frames for car trucks and has special reference to an improvement in construction which will facilitate manufacture without increasing cost,

expedite the removalof the core from the mold, and lessen or eliminate imperfections caused by shrinkage. The invention will be first fully described and then particularly defined in the appended claims.

In the accompanyingdrawing, Figure 1 is a side elevation of a portion of a side frame of the type shown inl Letters-Patent No. 1,523,793, issued January th, 1925, upon an application vfiled by M. R. Hansen and 1li myself. l Y

Figure 2 is a view showing the side 'frame .in section on the line 2*-2 of Figure 1, hatching being employed to represent portions of the mold and the cores. v

Inthe` type of side frame illustrated and above mentioned, compression member 2 merge into the top of the journal box 3 and the` tension member Vruns continuously from the top of the spring seat directly to the top of the journal box, the tension and compression members being of inverted channel form in cross section. Itis the usual practice in the manufacture of car truck side frames 'to make molds and cast the frames on their sides, the inside or hollowed out portion of the channels being formed by cores 5and'6 which are placed in the mold, indicated at 7 the arting of the mold being midway between/t 1e sides as in- .dicated by the line 8. In the usual construction, the width of the compression member is that indicated by the line 9-10 and the Width of the tension `member is the same as that of the compression member, but by the present invention the width of the tension member is greater than the compression member and is represented by the line 11-12.

In steel castings of this type, it is desirable to have large radii at the corners, 13, 14, for the reason that the more gradually the change in direction between Y fianges is effected the more completely will shrinkage imperfections in the corners be eliminated. The radius of the corners 13 is not limited by the method of manufacture because, whether it be large or small, the

pattern can be readily drawn from the mold.

In the usual construction at the corners 14, however, theradius is limited because it is not convenient to make it greater than the the tension member 1 andl the plate and thickness, 15, of the side flanges of the compression member. If it be made greater, at the same time maintaining the width 9-10, the straight edge 16 of the core 6 would have to be curved at its ends to conform to the curvature of the corners 14,: thus interfering seriously with the simplicity of the-core and increasing the cost. In `the improved construction, lthe straightedge of the core is maintained and the cornerfla may have a large radius by increasing the width of the tension member, as shown, so as to permit the formation of the corner entirely l.outside the core. This construction will permit the use of a-radius as large as desired without resorting to additional cores or adding to the-expense of manufacture of cores now in use. For manufacturing reasons, the increase iny width will occur more or less abruptly along the lines 17-18 and 19-20, Figure 1, the outstanding flanges along these lines concealing any abrupt odset which might be unsightly except for these flanges.

y Having fully described my invention what I claim as new and desire to secure by Letters Patent, is

l. A cast side frame for car trucks having tension and compression members of inverted channel formation, the width of the tenf sion member being greater than the Width of the compression member whereby the corners' of the tension membermaybe formed upon a large radius.

2. A cast side frame for car trucks having l tension and/.compression members of,invertf ed channel (formation,` the width of the tension member being greater than the width of the compression member and being abruptly increased through portions near both its ends.

- 8. A cast side frame for car trucks having tension and compression members of inverted channel form, the corners of the tension member being located in planes laterally beyond dthe planes of the' sides of the compression member.

4. A cast steel side frame for car trucks having tension and compression members' of inverted channel formation, the width of the tension member being greater than the width of the compresrvfion member and at both ends being made abruptly greater than-the members connected to its upper side.

In testimony whereof, I have signed this specification.

HARRY WALTER STERTZBACH. 

